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Full Discussion: sed to delete character 0 only when it's on its own?
Top Forums Shell Programming and Scripting sed to delete character 0 only when it's on its own? Post 302448056 by Bashingaway on Wednesday 25th of August 2010 07:05:23 AM
Old 08-25-2010
sed to delete character 0 only when it's on its own?
Hi all

I am trying to get my head around doing the following....

I have an input field that could contain either a number a blank field or a whitespace field.

What I want to do is delete a 0 (zero) if it's on its own or leading the number.

So:-

\t0 delete the zero
0 delete the zero
0\t delete the zero

10 do NOT delete the zero
\t10 do NOT delete the zero

Please do not just post a response showing a solution without explaining how it works else I can't learn for next time.

Thanks in advance.

---------- Post updated at 12:05 PM ---------- Previous update was at 12:03 PM ----------

Sorry I should add I want to do this using just sed for reasons too boring to explain here.
 

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LEARN ABOUT DEBIAN

snsplit

snsplit,v0.3.8(8)					      System Manager's Manual						 snsplit,v0.3.8(8)

NAME

       snsplit - split an article stream into individual articles

SYNOPSIS

       snsplit [-r] [field... -] prog...

DESCRIPTION

       snsplit	reads  an  article stream from descriptor 0 and splits it into separate articles, invoking prog...  on each, with the article ava-
       iable on descriptor 0.  This is useful as a quick-and-dirty way of filtering an article stream.

       The incoming article stream is expected to be in wire format, with lines ending in CRLF, leading dots doubled, and delimited by a dot on  a
       line by itself.

       The  article  presented	to  prog...  will have lines that end in a bare newline, will have all header lines unfolded, leading dots will be
       unstuffed, and the article will be terminated by end-of-file.

ARGUMENTS

       prog...
	      is the program (with arguments) to run on each article.  If prog...  exits with any kind of failure, snsplit aborts.

       field...-
	      are optional header field names.	If these are specified, the value of the first header field of that name will be exported into the
	      environment.  This field...  list must be terminated by the hyphen.  See also ENVIRONMENT below.

OPTIONS

       -r     Expect input articles in rnews batch format instead.

ENVIRONMENT

       snsplit sets some environment variables.  If the environment already contains these variables, they will be overwritten.

       SEQUENCE
	      If  already set to a positive value, it is incremented for the first article.  If it isn't set, is set to one for the first article.
	      Thereafter it is incremented for each subsequent article.  The value is always a 6-digit number with leading zeroes, and it can roll
	      over.

       BYTES  contains the size of the current article.

       HEAD_LINES
	      The number of lines in the head of the article, excluding the blank separator line.

       BODY_LINES
	      The number of lines in the body of the article, excluding the blank separator line.

       FLD_FIELD
	      If  any  fields are specified on the command line, where field is the name of an article header field, then FLD_FIELD will be set to
	      the value of field, where FIELD is the same as field but with lower case characters changed to upper case, and all  hyphens  changed
	      to  underscores.	 Confusing?  If field is message-id, then FLD_MESSAGE_ID will be set to the value of the first Message-ID field in
	      the current article, if there is one.

EXIT CODES

       snsplit exits 0 on success, 1 on usage error, 2 on system error, and 3 on article format error.	If  prog...   exits  with  other  than	0,
       snsplit will also exit that value.

N.B.								    Harold Tay							 snsplit,v0.3.8(8)
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